blind pig

noun3

1. •
   (US, slang) A blind tiger or speakeasy.

   • Then the harpooner carried away a pink flask to be filled in some blind pig, for there were no licensed saloons in that locality. We drank the cheap rotgut out of tumblers. — 1913
2. •
   (Southern-US) A police officer who has been bribed to ignore illegal activities.
3. •
   (Internet) A Web address on the Deep Web that piggybacks on a public domain but is not visible to the system.

   • The Web address isn't officially registered, it's a blind pig. — 2017